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Technical Bulletin

Bulletin No: PRO-01-27 Effective Date: 9/15/84 Cancels: NA Page: 1 of 1

Subject:

ENGINE OIL AND COMPRESSOR INLET CARBONIZATION

Bendix has learned through extensive laboratory testing and fleet surveys that multiviscosity (15W40) oils can

cause compressor inlet carbonization, which results in slow air build-up in the compressor load cycle.

Carbonization attributable to the use of multiviscosity oil is generally manifested by a soft sticky deposit that

causes inlet valve and/or unloader malfunction. Commercially available multiviscosity oils vary considerably in

their tendency to form these deposits. Heat build-up in the inlet cavity due to turbocharging aggravates the

tendency to form deposits with multiviscosity oils. Single viscosity oils such as SAE 30 or 40, however, have been

shown not to form deposits of the type described.

When an increase in the incidence of compressor carbonization is encountered, an alternative oil type should be

considered along with an investigation of the compressor cooling and induction systems.

Technical BulletinBulletin No: PRO-01-27 Effective Date: 9/15/84 Cancels: NA Page: 1 of 1Subject:ENGINE OIL AND COMPRESSOR INLET CARBONIZATIONBendi

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BENDIX TCH-001-027 Bedienungsanleitung